Two construction workers and a concrete mixer, Mount Wilson. Construction of a large water reservoir is underway. The construction worker on the left is standing on a wooden platform; the worker on the right is holding a wheelbarrow to catch wet concrete from the mixer's spout. Several shovels are on the ground in the surrounding area. Trees are in the background, behind the mixer. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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